I had a ferret exhibit exactly the same symptoms. Diarrhea and then prolapsed rectum and then intermittent diarrhea again. The vet found two large hairballs in his stomach. You may want to check for a partial blockage. Anecdotally it seems that kits have prolapsed rectums more often than adult ferrets as a result of eating dry kibbled food too early. I've not heard of too many cases of prolapsed rectums in adult ferrets. Lori [log in to unmask] [Posted in FML issue 2885]